chart.cpp Example File

dynamicspline/chart.cpp
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#include "chart.h" #include <QtCharts/QAbstractAxis> #include <QtCharts/QSplineSeries> #include <QtCharts/QValueAxis> #include <QtCore/QRandomGenerator> #include <QtCore/QDebug> Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags): QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(0), m_axisX(new QValueAxis()), m_axisY(new QValueAxis()), m_step(0), m_x(5), m_y(1) { QObject::connect(&m_timer, &QTimer::timeout, this, &Chart::handleTimeout); m_timer.setInterval(1000); m_series = new QSplineSeries(this); QPen green(Qt::red); green.setWidth(3); m_series->setPen(green); m_series->append(m_x, m_y); addSeries(m_series); addAxis(m_axisX,Qt::AlignBottom); addAxis(m_axisY,Qt::AlignLeft); m_series->attachAxis(m_axisX); m_series->attachAxis(m_axisY); m_axisX->setTickCount(5); m_axisX->setRange(0, 10); m_axisY->setRange(-5, 10); m_timer.start(); } Chart::~Chart() { } void Chart::handleTimeout() { qreal x = plotArea().width() / m_axisX->tickCount(); qreal y = (m_axisX->max() - m_axisX->min()) / m_axisX->tickCount(); m_x += y; m_y = QRandomGenerator::global()->bounded(5) - 2.5; m_series->append(m_x, m_y); scroll(x, 0); if (m_x == 100) m_timer.stop(); }